Trip-valve structure



Juy 3G, i929. P. w. KNAUF TRIP VAT- NE STRUCTURE Filed NOV. 23, 1925 2 Sheets-Sheet Ilan-l I l- EE,

I N VEN TOR.

A TTORNE Y.

July 30, 1929. P. w. KNAUF 'TRIP VALVE STRUCTURE Filed Nov. v25, 1926 2 Sheets-Sheet 2 INVETOR.

By W74 30 Af A TTORNEY.

Patented July 30, 1929.

vIPAUL W. KNAUF, OF CYNWYD, PENNSYLVANIA,

ASSIGNOR TO SCHUTTE AND V IKOERTING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

TRIP-VALVE STRUCTURE. l

Application filed November 25, 1926. Serial No. 150,169'.

vMy invention relates to trip valve structures for use'in connection with turbine and other engines. L

The general object of theinvention is to provide a novel construction of means for facilitating the closing action of the valve element of such a valve structure in case the tripping mechanism is released.

It also -is an object of theinvention to provide a trip valve structure in which the valve stem or shaft consists of two parts coupled together and relatively rotatable, one of the said parts extending through the valve casing and being connected with the valve therein, while the other of said parts is locatedoutside of the said valve fcasing and is of greater diameter thanthe first named portion which extends through the said valve casing. f

Another object of the invention is to provide a trip` valve structure comprising a valve stem consisting oftwo partos relatively rotatable, one of which'is located outside of the valve casing and the other one of which lextends through the valve casing, its.. outer .end being exposed to the atmosphere, the first named member or part being ofgreater' diameter than the second named member or art. p In order that the invention may be readily understood and its advantages and objects fully appreciated reference should be had to the accompanying drawings in which I have illustrated certain forms of embodiment thereof. However, it will be understood that the invention is susceptible of embodiment in other forms of construction than those shown and that changes in the details of construction may be made within the scope of the claims withoutv departing from the said invention.

In the drawings: Fig. 1 -is a view in central longitudinal section of av trip valve structure embodying the invention;

Fig. 2 is a view taken in a plane substantially atright angles to that in which Fig. 1 lis taken, said view being partly in section and partly in elevation;

Fig. 3 .is a transverse sectional view taken 'on the line 3 3 of Fig. 2; v

Fig. 4 is a transverse sectional view taken Fig. 5 is a view in section of a fragmentary portion of the structure' taken in the same plane as that in which Fig. 1 is taken but showing a modified yconstruction em# i bodying the invention.

In the drawings, 1 designates a valve casing of known construction provided with a valve seat 2 interiorly thereof with which a valved'3- is adapted to cooperate. The valve 1s provided with a spool 4 provided upon its outer end with an enlargement 5 which operates 1n theguiding inwardly extending tubular. portion 6.

The upper portion of the spool upon which the valve 3 is mounted is flared outwardly and projects into a cylinder 10." The valve spool and the valve are guided in their reciprocating movements by the cylinders 6 and 10, all in` known manner. The steam flows through the valve casing and through the valve-opening therein in the direction of the arrows 11. The front or left hand portion of the valve chamber is in communication, as usual, with the interior of the cylinder 10 through openings 15 and 16. The upwardly flared inverted truncated shaped lportion of the spool upon which the valve A3 is mounted is provided upon its inner side with avalve seat 17 with which a relatively movable pilot valve 18 cooperates. The pilot valve 18 is limited in its movements away from thevalve seat 17 by means of a yoke 20 secured to the outwardly flared portion of the spool previously referred to. The yoke 20, as well as the spool 4 and also the pilot valve 18 are provided with alined openings extended therethrough. Through the said openings the section or part 25 of a valve actuating rod extends. The said rod has screw threaded connection with the opening through the pilot valve 18 and is provided with a nut or sleeve 26 which engages the adjoining portion of said pilot valve'on the erates with ,the valve seat 17 previously referred to.

The lower side of the' valve casing 1 is provided with an opening in alinement with the cylinder 6 previously referred to, which opening is closed by means of 'a cap or cover 30. The part 25 previously referred to extends through an opening 31 in the said L cover and through an enlarged recess or same side as that which coop- Assuming that the pilot and main 'valves are in closed position as. shown in the drawings and that .the double-armed lever 66 occupies the position shown in dash and dot lines in Fig. 2 with the member 60 in corresponding lowered position, the said member 60 may be adjusted upwardly to effect upward or outward swinging movement of the lever 66 by rotation of the member 52 of the valve actuating rod toward the right. When the lever 66 has reached its outermost position it is engaged automatically by the catch or trigger 7 0 and its further outward movement'is llimited by the contact of al projection 81 thereon with a stationary contact 82. The said lever having thus reached its limit of outward lnovement the part 52v is locked against further rotation in the direction in which it had been rotated previously. Thereafter, in order to effect opening movement of the pilot and main valves, the first named valve being first opened for reasons well known in the art, the part 52 is thenrotated in a reverse direction as a result of which the said part is moved outwardly or away from the valve. By reason of the coupled connection between the parts 52 and 25 (or 25a as the case may be) the said part 25 or 25a likewise is moved outwardly to effect opening movement of thev pilot and main valves. By `reason of the fact that in order to actuate the pilot and main valves it is necessary only that the part 52 be rotated, the part 25 or 25, as the case may be, may be of-substantially less diameter than the said part 52. In other words, because the part 25 or 25u is not subjected to a twisting or torsion force it is not necessary that it be of relatively reat strength as compared with that of t e portion 52 which is subjected to such twistlng or tor-` sion force. By reason of the fact that in the construction as shown in Figs. 1 and 2 the member 25 extends entirely through the valve casing l so that both ends thereof are exposed to the atmosphere, it follows that the steam pressure within the said casing has no effect thereon tending to move the same in either direction or to hold the same against movement. As a result of that arrangement it will be seen that there isno force present tending to hold the valve in open position after movement of the catch or trigger 7 0 to release the swinging end of the lever 66. It follows, therefore, that upon the tripping of the saidy lever the valve moves quickly and surely into closed position. But for the vpresence of friction between the relatively movable parts of the valve structure the spring 75 `would not be necessary, but to insure closing action in all. cases and at all times when the catch or trigi ger 7 0 is released the presence of said spring is desirable. AHowever, the said spring may be of relatively light construction thereby affording a more economical Aconstruction than heretofore Ihas been practicable.

In Fig. 5, inwhich the part 25a does not extend through the valve casing and in which both ends thereof are not exposed to the atmosphere outside of the said casing, the steam within the said casing. doesexert pressure tending to preventclosing of the u valve upon release of thel catch or trigger 70.

However, in view of the fact that the dialneter of the part 25a is greatly reduced, by

reason of the coupling connection between the said partfand the part 52 as previously described, the pressure of the steam tending to cause outward or opening movement of the valves is relatively small as compared withy what would be the case if-the diameter of the part 25il were the same as that of the part 52.- Thel smaller the 'diameter of the part 25a ,the less the pressure exerted thereon by the steam tending to prevent closing movement of the valve upon tripping of the .catch or trigger 70.

It will be seen that by my invention I have provided meanswhereby the lclosin of thel valve upon release of the catch lor trlgger 70 is facilitated and whereby economy in conl struction is obtained.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: y

1. A trip valve structure, comprising in combination a valve casing having a passageway therethrough through which a vapor under pressure is adapted t flow, a valve located within thesaid casing for opening and vclosing the said passageway, a valve actuating rod consisting of two parts, one of which parts extends through the said vvalve casing transversely of the fluid pa ageway therethroufgh, the opposite ends o which part are o equal diameters and are exposed to the atmosphere whereby the said part is balanced, means for rotatably Iconnecting the other of said parts to the part which extends through the said valve casing, and means for effecting rotation of the said other part,

2. A trip valve shucture, comprising in combination a valve casing having a passageway therethrough through which a vapor under pressure is adaptedfto flow, al valve mounted within the said valve A casing for opening and closing the said passageway to extending throughI the said valve cas'ing ing connection with the said valve,

s ite ends of which' rod are of equal diameters control the flow of Huid therethrough, ay rod L '120 and are exposed to the latmosphere.whereby the said'iod is balanced, arod supported ext'eriorly1 of the said valve casing in aline- L ment wit the rst named rod, and coupling means for rotatably connecting the second adjoining end of thev named rod with the first named rod.

3. A trip valve structure, comprising in combination a valve casing having a passageway therethrough through Which a Va o1' under pressure is adapted to flow, a va ve mounted within said casing for opening and closing the said passageway, a rod extending through the said valve casing transversely of the said passageway, the opposite ends of which are exposed to the atmosphere, a rod located exteriorly of the said valve easing in alinement with the first named rod, the said second named rod being of greater diameter than the first named rod, means for rotatably coupling the second named rod to the first named rod, a tubular member through which the second named rod extends, a tubular element mounted Within the said tubular member and having screw threaded connection with the said second named rod, and yielding means located within the said tubular member and tending to canse movement of the said tubular element toward the said valve casing, substantially as described.

4. A valve structure comprising in combination a valve casing having a passageway therethrough, a valve mounted in said casing for opening and closing said passageway, a rod extending through the said valve casing transversely of the said passageway the opposite ends of which project from the said casing and are ot equal diameters, a rod located exteriorly of the said valve casing in alinement with the first named rod, the second named rod being of greater diameter than the first namedrod, and means for rotatably couplinothe second named rod to the first named ro In testimony that Irelaim the foregoing as my invention, I have hereunto signed my name this 17th day of November, A. D. 1926.

PAUL W. KNAUF. 

